#include<iostream>
using namespace std;

void swap(int& x, int& y)
{
 cout <<" x = " <<x <<" y = " <<y <<endl;
    int temp = x;
    x = y;
    y = temp;
cout <<" x = " << x <<"  y = " <<y <<endl;
}    
int main()
{
    int n, m;
    cin >> n >> m;
    cout <<" n = " << n <<"  m = " <<m <<endl;
    swap(n, m);
    int a = 20;
    int b = 11;
    swap (a, b);
    cout <<" n = " << n <<"  m = " <<m <<endl;
    system("pause");
    return 0;
}